Measurement of biogenic CO2 fraction (a)

How PmcTrace take the sample

The system take a very small gas sample proportional to the velocity in the stack using EN/ISO 13833 standard. Sample size varies from 0,2 to 30 ml/min. The velocity in the stack is measured using the Genius5-Pitotsensor.

The gas is sucked over a cartridge, filled with absorbent, which samples humidity and CO2 in a quantitative way. Long term sampling is done over a periode of 2 weeks up to 1 month. In 1 month, the CO2 content of 0,5 ml/min x 80 min x 24 hours x 30 days = 21,6 liters of flue gas is extracted. With 10% CO2 and 20% H2O, 4,4 g of CO2, dependent on proportional factor, is sampled in 1 cartridge. While the sampling periode the operator registers alternative and biomass fuels with amount and specification,to calculate the reference pmC valuefor 100% biomass.

Measurement of the biomass fraction (BF)

After the measurement periode, the cartridges are sent to Genius5-Instruments, where the cartridge is weighted and the absorbent is removed and packed in a sealed bottle. New abssorbentmixture is inserted to the cartridge. Allof these processes are done in a glove box with very low CO2 levels to ensure low blanks.

The 14C laboratory evaluates the sample with high accelleration mass spectrometry and calculates the biogenic fraction, based on the reference 105 pmC = 100% biogenic. Typical accuracy of the pmC result is within 0,3 %.

Based on the fuel specifications and measured fuel amounts from standard methodology,the reference pmC (100% biogenic = pmC) is calculated summing up all of the fuels with their portion and individual pmC value, based on age and year of harvest.

genius5 pmctrace brochure.pdf